Quantum cryptography with entangled multiphotons of the same polarization

Collective Band Structures and Identification of One-Phonon and Two-Phonon γ-Vibrational Bands in 109 Tc

“…Counts per channel (10 Yrast band (1) was reported in Ref. [14]. We confirmed the levels and transitions in this band up to the 1797.9 keV level.…”

“…However, we can not see the 756.4, 665.0, 601.3, 464.1 and 221.5 keV 𝛾-peaks reported in Ref. [14] (the 602.0 keV peak in Fig. 2 belongs to a Cs partner).…”

“…Six transitions of 756.4, 665.0, 601.3, 464.1 and 221.5 keV reported in Ref. [14] can not be observed, and so the two levels at 2552.9 and 3218.0 keV have also not been confirmed. In addition, at the high spin, we observed a new transition of 633.1 keV above the 3340.5 keV level in this band.…”

“…To give more experimental data of the 2𝛾 band in odd-𝐴 nuclei, the high-spin states of the very neutron-rich 109 Tc nucleus are re-investigated in this work. In the previous work, [13,14] some highspin states in 109 Tc were reported. Here we give the new result in 109 Tc.…”

Effects of multiple pairs on visibility measurements of entangled photons generated by spontaneous parametric processes

“…Since accidental coincidences are caused by multi-pair events, it is obvious that the probability of observing an accidental coincidence depends on the number distribution of the entangled photon pairs. The work by Luo and Chan [17] and Lim et al [18] suggests that the pair number distribution becomes thermal-like when the photons generated in multi-pair emission events are quantum-mechanically indistinguishable. On the other hand, it is known that the distribution becomes Poissonian when the photons are distinguishable [19,20].…”